GYPSUM ROOF TILE
Solid and Hollow
FIRE RESISTING HEAT CONSERVING
LIGHT WEIGHT AND ECONOMICAL
TWO TYPES PYROBAR Reinforced
OF TILE Gypsum 30" Roof Tile
are made in two types
"Solid" and "Hollow." Both types are in-
dividually factory moulded, insuring uni-
formity in size and weight and are made of
"STRUCTOLITE," a specially prepared
gypsum. All tile are reinforced with steel
and are designed to carry the full roof
load. Both types have face dimensions
of 12 x 30*. The solid tile are 3" thick;
the hollow tile are 4" thick.
ECONOMICAL PYROBAR Rein
forced Gypsum R
Tile are economical in first cost, and
the decks are fireproof and perman'
the maintenance co ' :1. Th
quickly and rapidly erected in any
weather. The Tile weigh than IS
pounds per square foot, which decree
the usual amount of supporting steel.
These factors make PYROBAR ideal
tile for meeting re-roofing probler.
I'NITED STATES GYPSUM COMPANY
205 WEST MONROE STREET CHICAGO, ILL
Photograph illustrates the ease with which Pyrobar
Gypsum Roof Tile can be placed on purlins. The
lightness of Pyrobar, compared with other roofing
materials, reduces handling and haulage costs.
Roderick Garage, Denver, Colo. Architects, Roeschlaub & Fuller,
Denver. Composition, tar and gravel roofing can be applied
directly to Pyrobar Gypsum Roof Tile.
These tile are suited to
any type of roof, flat or
steep, and are laid on
tee iron purlins. The
spaces between tile and flange of the tee irons
are filled with gypsum grout which bonds the
tile together and forms a homogeneous deck
with an even surface, to which any type of
roofing may be applied immediately. The
tile may be easily cut to fit any roof framing.
fords the greatest
degree of protec-
tion against con-
densation, or "sweating," owing to the fact
that, due to its low conductivity, the temper-
French Battery & Carbon Company's
Architect, Worden Allen Conpv, Chicagi
Roof Tile reduces the averagtrettmtiine
on purlins as soon as the stye framework
covering applied directly aftt the roof do
ature on the underside of the roof will remain
the same as the average temperature in the
room. Consequently, there will be little or
no condensation caused by warm, damp air
striking a cool under-roof surface.
Gypsum has a lower conductivity, and hence
greater insulation value, than any other fird-
proof building material used for structural
purposes, one inch thickness of Pyrobar beinp;
equivalent to ten inches of concrete as an
4 1" so
The relative coefficient of conductivity of COO
PYROBAR Gypsum Roof Tile and other roof * $UN
deck materials has been determined by tests
and the following coefficients obtained : ing t
American Ship Building Company's Foundry. Cleveland.
Ohio. Architect. The Crowell-Lundoff Little Co.. Cleveland.
Ohio. Typical Monitor Roof Construction. Lightness of
steel construction and white light reflective qualities of tile
are big items in factory management.
Lunkenheimer fit Company's Foundry. Cincinnati. Ohio Arch-
itects Bert L. Baldwin & Co., Cincinnati. Ohio Sn
erection of sawtooth, monitor ends and skylight
~>bar Gypsum Roof Tile is a material factor in erection costs
Architect. Worden Allen Co.
of PYROBAR minimizes c<*
tion. This i* of speoa
, Company's Factory. Madison. Wis. Aluminum Foundry, Simplex Auto .Company New Brunj- c J^ rat ^™^hfry D.'v"! K^"^
,pany, Chicago 111. Pyrobar Gypsum wick New J^Jf^™"* ^ ^TSSa*n wfS dense lie ta££d I to " whi/h s.ate'was dfrectly nailed.
; erection time, because it can be placed Company. New York City N . Y f^^'"^ concrete It is Felt can be used underneath slate, if desired. The tile
S\tToTdtk S is r i e „ Ct p e i d ace and thC r ° 0f 6?, H g h E t U e? e t r ha fi nco„ a rce U t b ef s^th^u^^ -'easily cu, and fitted around dormers, turrets, etc.
Conductivity is expressed in terms of B. USE OF TABLES On the following page
, t. u.'s transmitted per hour per square foot are shown tables giving
of surface per degree Fahr. difference in s i ze f tee j ron sub-purlins for various purlin
temperature. spacings, and purlin sizes required for various
_ vj , . , Relative Therma.Conductivitv § ^ support PY ROBAR based On 3
S °rnixtu?e Crete 0.750 total live load of 50 pounds per square foot.
| V SE^S?: . i i I i * SJS ENGINEERING Expert engineering service
k 3" solid Gypsum Roof Tile. 0.250 SERVICE will be rendered by us in
4" hollow Gypsum Roof the selection of the type
| Tile 0.200 f construction best suited to the purpose of
„ „,., each building. Designs, detailed plans and
2?Syy» IN P 3 ROBAR Roof ™JJ° n specifications will be drawn up without cost.
SUMMER vide maximum protection *
against summer heat, keep- Our construction department contracts for
ing the interior air of a building cool. the erection of PYROBAR.
> Company's Factory, Madison, Wi?.
C Chicago, 111. The low conductivity
. ndensation and provides heat insula-
^ptrtance for paper mills and wet process
JS used in this installation.
Martin Apartment Building, Chicago. 111. Architect, Howard
Shaw Chicago, III. Mansard Roof Construction for fireproof
buildings, slate or copper roofing being nailed directly to tile.
The St. Mel High School, 42nd Ave. and Madison St.,
Chicago, III. Architect, Wm. F. Gubbins, Chicago, III.
Pyrobar Gypsum Roof Tile are easily cut and fitted to
special roof framing. Extra dense PYROBAR are
furnished when Ludowici or heavy baked clay tile are
to be used.
Data Required for Designing Pyrobar Reinforced Gypsum Tile Roofs
Sizes of Channel Purlins for Pyrobar Tile Roofs
Total load SO lbs per s<p. rr /hcluo/hg weight or roof.
9 k m J
D/ stance Center to Center of Trusses jn Feet
. • a ■
to jz 14 i6
3 ZO I ZZ
8-iii l S"-i3k
5'-6 l z
/2 l 20 2 |
12'- 2 5 \
SPANS FOR WHICH VARIOUS T (Rons
SPACED 30± inch CEHTERS WILL CARRY ft
TOTAL LOAD OF SO LBS PER SQUARE FOOT
5IZ.E T iRon
Ur to S'-3"
S'~3" to S'-lOz
S'-lOk' To <3-S±
<3'-S±" to e-o
3" x 3' x G8*